VGS was fortunate enough to talk to Shinobi602 about the potential announcements from Santa Monica Studio at E3 of God of War 4. The industry insider had already confirmed that he believed the game would be showcased during the Sony press conference.
All information is rumor and cannot be considered official confirmation
Interview with Shinobi602
I think they’re going to have a big “coming out party” for God of War 4, or the new God of War, it may not be called that. I don’t know that Kratos will be at E3 on stage, but he’ll be in the game, in some way, shape, or form.
The game was confirmed back in December of 2014 with screenshots leaked a few months later.
I think we’ll see Last Guardian again. It’s supposed to be scheduled for later this year. They’ll probably have another trailer, but i’m not sure about a gameplay demo. They’ve been trying to pull it to it’s feet for a good 8-9 years, so I think it’s a safe bet it’ll be there since the release is set for this year. I think they’re going to say “Look, here it is, it’s coming on this day.”